What they're saying

Reaction to Andy Murray's announcement on Friday that this year's Australian Open could be his last tournament as a professional:

"@andy_murray You are a champion on and off the court. So sorry you cannot retire on your own terms, but remember to look to the future. Your greatest impact on the world may be yet to come. Your voice for equality will inspire future generations. Much love to you & your family."

Former women's No 1 Billie Jean King